Paris Hilton — Rips Radio Host ON THE AIR — ‘He’s A F**king A**hole’

Paris Hilton went ballistic after a radio interview this morning … launching into an expletive-filled rant against the DJ who had just interviewed her … calling him a “f**king a**hole” … without realizing she was STILL ON THE AIR.

Paris was on the phone with a morning team in Raleigh-Durham — Bob and the Showgram — and midway through the interview … host Bob Dumas dropped the bomb: do you wish you had never made that sex tape

Paris was annoyed … but kept her cool … blaming it on her XXX co-star Rick Salomon … and calling him “a very sick man.”

But Paris couldn”t get off the phone fast enough … and when she mistakenly thinks she”s hung up and is off the air …. she goes off on the radio guy … who”s listening to the whole tirade.